<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    * {margin: 0;padding: 0;}
    .container {height: 100vh; display: flex; flex-direction: column; background-color: #f7f7f7; text-align: center;}
    .header{height: 60px; background-color: #fa5;}
    .content {flex: 1; background-color: #5fa; overflow-y: scroll;}
    .footer {height: 40px; background-color: #5af;}
    li {padding: 20px; margin-bottom: 50px;}
  </style>
</head>
<body>
  <div class="container">
    <div class="header">
      <h1>title</h1>
    </div>
    <div class="content">
      <div class="box">
        <h2>content</h2>
        <ul>
          <li>
            <h1>H1</h1>
          </li>
          <li>
            <h1>h1</h1>
          </li>
          <li>
            <h1>U</h1>
          </li>
          <li>
            <h1>U</h1>
          </li>
          <li>
            <h1>U</h1>
          </li>
          <li>
            <h1>U</h1>
          </li>
          <li>
            <h1>U</h1>
          </li>
          <li>
            <h1>U</h1>
          </li>
          <li>
            <h1>U</h1>
          </li>
          <li>
            <h1>U</h1>
          </li>
        </ul>
      </div>
    </div>
    <div class="footer">
      <nav>footer</nav>
    </div>
  </div>
</body>
</html>